Tool grinding machine



s. s. MADER 2,475,796

TOOL GRINDING MACHINE 3 Sheets-Sheet l ,die I July 12, 1949.

Filed March 8, 1946 ,W r e d m m a @mi #mi g M. m. 5 m i o.

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T001.. GRINDING MACHINE Filed March e, 194e .y :s sheets-sheet 2 n 66 a68 5 e4 .///L y \-4,3 I Q i@ "o qb.-

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July 12 1949- s. s. MADER 2,475,796

,TOOL GRINDING MACHINE Filed Marchl 8, 1946 3 Sheets-Sheet 3 PatentedJuly l2, 1949 or-FicE TOOL GRINDING MACHINE y Stewart S. Mader,

Worcester, Norton Company, Worcester,

tion of Massachusetts Application March s, 194s, serial No. 652,880

' '1 claims. (cl. 51-127) This invention relates to grinding machinesand more particularly to apparatus for precisely generatingpredetermined shapes on cutting tools.

One object of the invention is to provide a simple and thoroughlypractical grinding machine tor grinding a cutting tool withpredetermined clearance and rake angles. Another object of thisinvention is to provide an improved tool holder which is arranged sothat it may be adjusted in two directions so as to grind a predeterminedfront and side clearance angle on a cutting tool. A further object ofthe invention is to provide a tool holder having a. master templatewhereby a predetermined shape may be ground on a cutting tool havingpredetermined clearance angles. Another object of the invention is toprovide a tool holder which is adjustable in two directions, namely atilting adjustment and a rotary adjustment whereby the tool to be groundmay be positioned to grind predetermined clear, ance angles on thecutting tool.

Another object of the invention is to provide a tool holder with ahollow sleeve for supporting the tool to be ground and providing meansfor precisely tilting the sleeve and for precisely rotarily .adjustingthe sleeve to position the cutting tool lbeing ground to grindpredetermined front and side clearance angles thereon. Another object ofthe invention is to provide a tool holder which is arranged so that itmay be set up for grinding not only the predetermined clearance anglesbut also the desired and predetermined rake angle on the tool beingground. Other objects will be in part obvious or in part pointed outhereinafter.

'I'he invention accordingly consists in the features ,of construction,combinations of elements, and arrangements of parts, as will beexemplined in the structure to be hereinafter described, and the scopeof the application of which will be indicated in the following claims.

One embodiment of the invention has been illustrated in the accompanyingdrawings, in which like reference numerals indicate like parts andwherein:

Fig. 1 is a fragmentary cross sectional view through a tool grindingmachine.` showing the improved tool holder in an operating position;

Fig. 2 is a fragmentary plan view of the tool grinding machin showingthe tool holder;

Fig. 3 is a side elevation. on an emerged scale of the improved toolholder;

Fig. 4 is a horizontal sectional view proximately on the line 4 4 ofFig. 3, tool holder;

taken apand Mass., assignor to Mass., a corpora- 2 Fig. 5 is a frontelevation of the tool holder; Fig. 6 is a fragmentary horizontalsectional view through the tool holder, showing a tool set-up forgrinding the top rake.

A tool grinding machine has been illustrated in the drawings comprisinga base III which serves as a support for a rotatable grinding wheelhaving a plane operative face. 'Ihe grinding wheel is supported onthe'end of a wheel spindle I2. The wheel spindle I2 is preferably drivenby an electric motor I3 which is supported tlm a rearwardly extendingportion I4 of the base The base III also serves as a. support for aslide |'which is arranged so that it may be adjusted toward and from theoperative face of the grinding wheel in a manner similar to that shownin for a pivotally mounted tool holder supporting I surface so that thebase 3| may be through the platen I6. lhe platen I6 is provided with apair 0f aligned spaced supporting studs I1 and I8 fwhich are in turnsupported in upwardly extendpositioned in a horizontal plane by means ofa gage block 2| which is interposed between the slide I5 and the platenl5. If desired the gage block 2| may besubstituted with gage blocks .ofvarying heights soy that the operative surface of the platen I6 may bereadily adjusted into any desired angular position relative to theoperative face of the grinding wheel II.

To attain one of the main objects of this invention an improved toolholder is provided which is arranged so that the cutting tool may beprecisely adjusted and positioned for grinding predetermined clearanceand rake angles on a cutting tool being ground. As illustrated in thedrawings an improved tool holder 30 is provided comprising 'a` base 3|which is provided with a plurality of supi porting buttons or plugs 32,33, 34, 35, 36, 31, 38 and 39 each of which is provided readily moved inany direction on the work supporting platen 'I'he base 3| is providedwith an upwardly extending dovetailed slide Away 40 which mates with acorrespondingly shaped slide way formed on a transversely movable slideII. A nut and screw adjustingmechanism is provided for preciselyadiusting the position of the slide 4I transversely relative to the base3|. As illustrated in with a plane y adresse 3 the drawings a rotatablescrew d2 is supported wardly extending arms 46 and 41 which serve as asupport for a frame 48. Theiframe 4851 is pro--v vided with a pair citrunnion studs-T4! fand* 5in.l which are also supported in'fthefupwardlyjex# 4l'.- despair of-lmurled headed clamping screws 5| andi?through arcuate slots 53 and 54 'ormedinthearms 45 i and 4l respectivelyandfare screw threadedinto the frame 48. It will be readily apparentfrom tending arms 45 and the foregoing disci' that 'the frame 48 may bepivotally adjusted relative to the arms 4S and 41 by loosening theclamping screws 5I and 52, swinging the frame 4l to the desired angleafter which the clamping screws 5l and 52 may be again tightened toclamp the frame in the desired position. As illustrated in Fig. 3 acalibrated scale 58 is mounted on the frame 48. An index point isprovided on the arm 4i to facilitate readily adjusting the frame 45 to apredetermined angular position.

The frame 48 serves as a supportI for a rotatable sleeve 55 which issupported in a cylindrical bore 5B formed within the frame d8. Aclamping screw 51 is provided on the frame 48 to facilitate clamping thesleeve 55 in the desired position.

A hollow tool holding sleeve 50 is slldably keyed by means of a key 6|within a cylindrical bore 52 formed within the sleeve E5. The sleeve BGis provided with a square shaped tool supporting aperture 63.v Thesleeve 5'is provided with a threaded portion 64 which meshes with athreaded knurled collar 65. The collar 65 is provided with an integralliange 66 which serves as an end thrust member to allow rotation of thecollar 65, but arranged to prevent endwise movement thereof. In order tohold the'ilange 5l against endwise movement, the iiange 65 is 1ocatedbetween a surface 51 formed on the end of the sleeve 55 and a ange 58formed integral with a collar 59 which is screw threaded onto the sleeve55. The surface 61 and the ilange 68 serve to engage opposite faces ofthe flange 55 so as to prevent endwise movement thereof. It will bereadily apparent from the foregoing disclosure that the knurled collar65 may be rotated to produce an axial feeding adjustment of the sleeveill so as to facilitate an adjustment of the sleeve 60 relative to thebase 3| and the slide 4|.

To facilitate clamping a cutting tool IU within the square shapedaperture 53 of the sleeve 5l, a plurality of threaded holes 1| areprovided. One or more clamping screws 12 maybe placed in the desiredthreaded holes 'Il so as to clamp a cutting tool rigidly in positionwithin the aperture 53.

In order to grind the side clearance face 10a. the front clearance angle10b and the top rake angle 1lc to the desired and predetermined angles,the body 4l together with the sleeves 55 and 5I may be adjusted intopredetermined angular positions. In order to grind the desired frontclearance angle that is face 10b, the frame 4l may be tilted to thedesired and predetermined angle after which the frame 48 may be clampedin adjusted position. In order to obtain the desired side clearanceangle for precisely grinding side clearance face 10a the screw 51 may beloosened and the sleeve 55 rotarlly adjusted relad sleeve 55 a graduatedscale 13 is provided on the sleeve 55 and a zero or index point 14provided on the frame 48. After the sleeve 55 has been positioned asdesired for grinding face 10a, the

5 clamping screw 51 may be again clamped to lock the sleeve 55 in thedesired adJusted position.

Y In order 'to produce a predetermined contour or shapeon the end of thecutting tool, it is deslrablc'to provide a master form or template so.-10 Vfthet successive tools may be ground and reground to the sameidentical shape. As illus- .trated in the drawings. the base 3| isprovided with zin-extending projection 15 which serves as a support fora master form or template l5. The

1g; template 16 is provided with a pair of locating holes which matewith studs 11 and 18 mounted on the extension 15 oi' the base 3|. A pairoi clamping or set screws 19 and 80 are provided for locking themastervform or template in a predetermined position relative to the basei0.

In grinding faces of the tool 10, the improved tool holder may belplaced in position on the platen I6. The tool holder base 3l may bemoved so that the template 15 engages the guide 8|. 'I'he tool holder 30may be then moved along the base either longitudinally or transverselywith the template 16 at all times in an engagement with the guide 5| sothat the desired shape will be produced and` predetermined clearance 10aand 10b ground on the front and side faces of the cutting tool 10.

In order to facilitate adjusting the tool being ground relative to thetemplate 1B, adjustment may be made by means of the knurled knobs 44 and45 to produce a transverse movement of the slide 4| so as to adjust theface 10b of the tool 10 relative to the template 16. If lt is desired toadjust the face 10a, the sleeve 50 may be adjusted in an axial directionby manipulation 1f it is desired to grind a predetermined rake' angle onthe top of the tool, the tool 10 may be placed inthe positionillustrated in Fig. '6. In case a back rake angle is desiredon the topface of the tool 10c, a wedge-L'vlock 85 having an angle equal to thedesired back-rake angle is positioned within the aperture 83y of thesleeve 5I to position the tool as illustrated in Fig. 6 so that when thetemplate 16 is in an engagement with the guide 8|, a topback rake angleor the desired and predetermined extent will be provided. In case a siderake angle, as well as a back rake angle is desired. the sleeve 6 0 maybe rotarily adjusted to the desired angular position so that a combinedback and side rake angle will be produced. p

The operation of this improved tool grinding apparatus will be readilyapparent from the foregoing disclosure. A tool to be ground is clampedin position with the hollow sleeve 50. A template 1B having the desiredcontour is then clamped 'in position on the tool holder. The frame 48isthen adjusted to the desired angular position and the sleeve rotatedto angularly position the cutting tool so that when the tool holder 30is moved on the platen i5 with the template 18 in engagement with theguide 5| a predetermined side and front clearance angle will he producedon the tool 15 and at the same time the desired contour will be groundthereon. As previously described feeding unit adjustments may be madetive to the frame 4l. To facilitate setting the 15 t0 move the slide 4|transversely and the sleeve of the knurled collar or nut 85. By means ofY 60 axially so lthat the desired grinding operation may be accomplishedupon the cutting tool 10.

It will thus be seen that there has beenprovided by this inventionapparatus in which the various objects hereinabove set forth togetherwith many thoroughly practical advantages are successfully achieved. Asmany possible embodiments may be made of the above invention and as manychanges might be made in the embodiment above set forth, it is to beunderstood that all matter hereinbefore set forth or shown in theaccompanying drawings is to be interpreted as illustrative and not in alimiting sense.

I claim:

1. In a tool holder for tool grinding machines including a base, a framepivotally mounted on said base, a hollow sleeve rotatably supported insaid frame, means to clamp a tool tobe ground within said sleeve,precision means including a graduated scale precisely to tilt saidframe, precision means including a graduated scale precisely to rotatesaid sleeve so as to position a tool to be ground, means to clamp saidsleeveagainst a. rotary motion in the desired and predetermined positionto facilitate grinding a predetermined front and side clearance on atool to be ground, and means including a nut and screw mechanisminterposed between the sleeve and frame to feed said sleeve relative tosaid frame and base so as to advance the tool being ground during agrinding operation.

2. In a tool holder for tool grindingy machines including a base havinga plane supporting and guiding surface, a transversely movable slide onsaid base, a feeding mechanism to adjust said slide transverselyrelative to the base, a frame pivotally supported on said slide, meansprecisely to adjust said frame angularly relative to said slide, asleeve rotatably supported in said frame, clamping means to clamp saidsleeve in adjusted position relative to said frame, a nonrotatablehollow tool supporting sleeve slidably keyed within said first sleeve,means to clamp a tool to be ground within said hollow sleeve, and meansincluding a screw formed on the periph.-v ery of the hollow sleeve and arotatable nut rotatably supported on. said rotatable sleeve tofacilitate feeding said hollow sleeve axially relative to said firstsleeve and frame to facilitate feeding the tool during a grindingoperation.

3. In a tool holder for tool grinding machines including a ba-se havinga plane supporting and guiding surface, a transversely movable slide onsaid base, a feeding mechanism to adjust said slide transverselyrelative to the base, a template on saidl base, a frame pivotallysupported on said slide, means precisely to adjust said frame angularlyrelative to said slide, a sleeve rotatably supported in said frame,clampingmeans to clamp said sleeve in adjusted position relative to saidframe, a hollow tool supporting sleeve slidably keyed within said rstsleeve, means to clamp a tool to be ground within said hollow sleeve,and means including a screw formed on the periphery of the hollow sleeveand a rotatable nut 1'0- tatably supported on said rst sleeve tofacilitate feeding said hollow sleeve axially relative to said firstsleeve and frame to facilitate feeding the tool during a grindingoperation, said feeding mechanism serving to adjust said slide relativeto said template and base so as to adjust the side face of the toolbeing ground relative to the operative face of the grinding wheel.

4. In a tool holder for a tool grinding machine having a plane facedrotatable grinding wheel, an adjustable platen having a guide, a basehaving a plane supporting and guiding surface, a templatel detachablymounted on said base, a frame pivotally mounted on said base, meansprecisely ing said tool during a grinding operation, said guide andtemplate serving' to generate a predetermined contour on said tool asthe base is moved on said platen with the template in engagement withsaid guide.

5. In a tool holder for a tool grinding machine having a base includinga plane supportlng and guiding surface, a transversely movable slide onsaid base, a nut and screw mechanism to said frame, a hollow toolsupporting sleeve slidably keyed within said first sleeve, means to foradjusting said slide, a template detachably mounted on said base, aframe pivotally supported on said slide, means precisely to adjust saidframe angularly relative to said slide, a sleeve rotatably supported insaid frame, clamping means to clamp said `sleeve in adjusted positionrelative clamp a tool to be ground within said hollow sleeve, and meansto feed said hollow sleeve axially relative to said first sleeve andframe to facilitate a feeding movement of the tool during a grindingoperation.

6. In a tool holder for tool grinding machines having a base including aplane supporting and guiding surface, a transversely movable slide onsaid base, a nut and screw mechanism for adjusting said slide, a framepivotally supported on said slide, means precisely to adjust said frameangularly relative to said slide, a sleeve rotatably supported in saidframe, clamping means to clamp said sleeve in adjusted position relativeto said frame, a hollow tool supporting sleeve slidably keyed withinsaid rst sleeve, means to clamp a tool to be ground within said hollowsleeve, a threaded portion on the outer end of said hollow sleeve, and arotatable nut engaging said threaded portion which is held against axialmovement to facilitate feeding the hollow sleeve and tool relative tosaid base and frame during a grinding operation.

7. In a tool holder for a tool grinding machine including a base havinga plane supporting and guiding surface, a template detachably mounted onsaid base,l a transversely adjustable slide on said base, a yoke formedintegral with said slide having a pair of upwardly extending spacedarms, a frame pivotally supported by said arms, aligned opposed pivotedstuds on said arms to support said frame, arcuate slots in each of saidarms, clamping screws passing through said slots and screw threaded intosaid frame to facilitate a precise angular tilting adjustment of saidframe so as to grind a predetermined clearance angle Aon a` tool to beground, a sleeve rotatably journalled in said frame, means to clamp saidsleeve in adjusted position, a hollow tool holding sleeve slidably keyedwithin said first sleeve, means to clamp a tool to be ground within saidhollow sleeve, and means including a nut and screw mechanism to feedsaid hollow sleeve axially rel- 7 8 :tive to said mst sleeve tofacilitate Ieedinl l. Number Name Dato tool to be ground relative tosaid template. 467,857 Conradson Jan. 26, 1892 STEWART B. HABER.1,072,629 Lumsden Sept. 9, 1913 1,710,647 Probert et al. Apr. 23, 1929REFERENCES CITED 5' 1,807,999 VMcMurtry June 2, 1931 i 2,144,095 ZwickJan. 17, 1939 mflf smpmfgmw 'n f ma .n the 2,246,029 spuning June 11,1941 2,332,510 Franzen Oct. 26, 1943 UNl'I'ED STA'IES PATENTS L2,365,759 Howe Dec. 2s, 1944 Number Name Date 19 2.375.619 Bura May 8.1945 141,760 Card AUI. 12,

